[vtkusers] Problems with ComputeOBB - wrong OBB computed

[Goodwin Lawlor]

Would  methods like:

static int vtkMath::GetMean3 (vtkDataArray *array,  double mean[3])
static int vtkMath::GetCovarianceMatrix (vtkDataArray *array,  double
mean[3], double *covariance)

be a better way?

Goodwin

cf. for VTK devs see
http://vtk.markmail.org/search/?q=#query:%20list%3Aorg.vtk.vtkusers+page:1+mid:ppj3wtbusf537spk+state:results




On Wed, Aug 13, 2014 at 3:53 PM, Goodwin Lawlor <
goodwin.lawlor.lists at gmail.com> wrote:

> This wiki page should get you going:
> http://www.vtk.org/Wiki/VTK/Git/Develop
>
> Goodwin
>
>
> On Wed, Aug 13, 2014 at 2:40 PM, Oliver Weinheimer <mail at oliwe.com> wrote:
>
>> Hi Goodwin,
>>
>> yes I also think that this change can improve accuracy also in other
>> places
>> in VTK.
>> In my case, the mean calculation errors built up extremly, so that the
>> calculated OBB was unusable.
>> No, I'm not familiar with Gerrit, but I will have a look on it.
>> Thanks for your reply and help.
>>
>> Oliver
>>
>>
>> Goodwin Lawlor-2 wrote
>> > Hi Oliver,
>> >
>> > That's a nice method - the mean is gradually accumulated, preserving the
>> > accuracy of the floating point value. I'm sure there are other places in
>> > VTK that would benefit from this code change...
>> >
>> > If you're familiar with Gerrit, could you submit this change? I'll have
>> a
>> > poke around the code base to see if there are other similar mean
>> > calculations.
>> >
>> > Goodwin
>>
>>
>>
>>
>>
>> --
>> View this message in context:
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>> Sent from the VTK - Users mailing list archive at Nabble.com.
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